feat(ui): exit if token is incorrect; add exit button (#482)

Description

Related issue

#482 (closed)

Examples

Invalid token

• If the user enters a non-valid token, it will not be stored in the local storage.

Sign out

• If the user has valid token, they will be able to use the Sign out.

• The button will open up a modal which will remove the token and redirect them to the /auth page.

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED

Closes #482 (closed)